1939-1942 brake parts question

[benbuilder]

I have a model A project i just bought.
It has 39-42 brakes on it. I am trying to adjust the brakes but noticed the eccentric bolts wont turn.
I took both sides apart and found that behind the nut that holds the eccentric to the backing plate (driveshaft side, not the tire side) there are three different washers between the nut and the backing plate.
One had a star washer, one had a lock washer, one had a washer and one had nothing. What should be behind the nut?
I have searched and have not seen exactly the info i need to do this right.
thanks